import {Component, ElementRef, OnInit, ViewChild} from '@angular/core';
import {ActivatedRoute, Router} from "@angular/router";
import {HelpContentService} from "../../services/help-content.service";
import {FormArray, FormBuilder, FormControl, FormGroup, Validators} from "@angular/forms";
import {CheckDivId, DivId} from "../../utils/entities/adminTool/divId";
import {Page} from "../../utils/entities/adminTool/page";
import {EnvProperties} from '../../utils/properties/env-properties';

import {Session} from '../../login/utils/helper.class';
import {LoginErrorCodes} from '../../login/utils/guardHelper.class';
import {HelperFunctions} from "../../utils/HelperFunctions.class";
import {Observable, Subscriber} from "rxjs";
import {map, startWith} from "rxjs/operators";
import {MatAutocompleteSelectedEvent, MatChipInputEvent} from "@angular/material";

@Component({
  selector: 'divIds',
  templateUrl: './divIds.component.html',
})

export class DivIdsComponent implements OnInit {
  @ViewChild('AlertModalSaveDivId') alertModalSaveDivId;
  @ViewChild('AlertModalDeleteDivIds') alertModalDeleteDivIds;
  private selectedDivIds: string[] = [];
  public checkboxes: CheckDivId[] = [];
  public divIds: DivId[] = [];

  public myForm: FormGroup;
  public pageSearchCtrl: FormControl;
  public pagesCtrl: FormArray;

  private searchText: RegExp = new RegExp('');
  public keyword: string = "";

  public properties: EnvProperties = null;
  public formPages: Page[] = [];

  public showLoading: boolean = true;
  public errorMessage: string = '';
  public updateErrorMessage: string = '';
  public modalErrorMessage: string = '';
  public filterForm: FormControl;
  private subscriptions: any[] = [];
  public allPages: Page[] = [];
  filteredPages: Observable<Page[]>;
  @ViewChild('PageInput') pageInput: ElementRef<HTMLInputElement>;
  selectedPages: Page[] = [];
  selectedCommunityPid = null;

  ngOnInit() {
    this.filterForm = this._fb.control('');
    this.pageSearchCtrl = this._fb.control('');
    this.subscriptions.push(this.filterForm.valueChanges.subscribe(value => {
      this.filterBySearch(value);
    }));
    this.pagesCtrl = this._fb.array([]);
    this.myForm = this._fb.group({
      _id: '',
      name: ['', Validators.required],
      pages: this.pagesCtrl,
      openaire: true,
      connect: false,
      communities: true
    });

    this.route.data
      .subscribe((data: { envSpecific: EnvProperties }) => {
        HelperFunctions.scroll();

        this.properties = data.envSpecific;

        this.getDivIds();
        this.route.queryParams.subscribe(params => {
          this.selectedCommunityPid = params['communityId'];
          this.getPages();
        });
      });
  }

  constructor(private element: ElementRef, private route: ActivatedRoute, private _router: Router, private _helpContentService: HelpContentService, private _fb: FormBuilder) {
  }

  ngOnDestroy(): void {
    this.subscriptions.forEach(value => {
      if (value instanceof Subscriber) {
        value.unsubscribe();
      } else if (value instanceof Function) {
        value();
      }
    });
  }

  getDivIds() {
    if (!Session.isLoggedIn()) {
      this._router.navigate(['/user-info'], {
        queryParams: {
          "errorCode": LoginErrorCodes.NOT_VALID,
          "redirectUrl": this._router.url
        }
      });
    } else {
      this.showLoading = true;
      this.updateErrorMessage = "";
      this.errorMessage = "";

      this._helpContentService.getDivIdsFull(null, this.properties.adminToolsAPIURL).subscribe(
        divIds => {
          this.divIds = divIds;
          this.checkboxes = [];

          let self = this;
          divIds.forEach(_ => {
            self.checkboxes.push(<CheckDivId>{divId: _, checked: false});
          });

          this.showLoading = false;
        },
        error => this.handleError('System error retrieving classes', error));
    }
  }

  // public showModal():void {
  //     this.modal.showModal();
  // }

  public toggleCheckBoxes(event) {
    this.checkboxes.forEach(_ => _.checked = event.target.checked);
  }

  public applyCheck(flag: boolean) {
    this.checkboxes.forEach(_ => _.checked = flag);
  }

  public getSelectedDivIds(): string[] {
    return this.checkboxes.filter(divId => divId.checked == true).map(checkedDivId => checkedDivId.divId).map(res => res._id);
  }

  private deleteDivIdsFromArray(ids: string[]): void {
    for (let id of ids) {
      let i = this.checkboxes.findIndex(_ => _.divId._id == id);
      this.checkboxes.splice(i, 1);
    }
  }

  public confirmDeleteDivId(id: string) {
    this.selectedDivIds = [id];
    this.confirmModalOpen();
  }

  public confirmDeleteSelectedDivIds() {
    this.selectedDivIds = this.getSelectedDivIds();
    this.confirmModalOpen();
  }

  private confirmModalOpen() {
    if (!Session.isLoggedIn()) {
      this._router.navigate(['/user-info'], {
        queryParams: {
          "errorCode": LoginErrorCodes.NOT_VALID,
          "redirectUrl": this._router.url
        }
      });
    } else {
      this.alertModalDeleteDivIds.cancelButton = true;
      this.alertModalDeleteDivIds.okButton = true;
      this.alertModalDeleteDivIds.alertTitle = "Delete Confirmation";
      this.alertModalDeleteDivIds.message = "Are you sure you want to delete the selected class(es)?";
      this.alertModalDeleteDivIds.okButtonText = "Yes";
      this.alertModalDeleteDivIds.open();
    }
  }

  public confirmedDeleteDivIds(data: any) {
    if (!Session.isLoggedIn()) {
      this._router.navigate(['/user-info'], {
        queryParams: {
          "errorCode": LoginErrorCodes.NOT_VALID,
          "redirectUrl": this._router.url
        }
      });
    } else {
      this.showLoading = true;
      this.updateErrorMessage = "";
      this._helpContentService.deleteDivIds(this.selectedDivIds, this.properties.adminToolsAPIURL).subscribe(
        _ => {
          this.deleteDivIdsFromArray(this.selectedDivIds);
          this.showLoading = false;
        },
        error => this.handleUpdateError('System error deleting the selected classes', error)
      );
    }
  }

  public editDivId(i: number) {
    let divId: DivId = this.checkboxes[i].divId;
    this.formPages = <Page[]>divId.pages;
    this.pagesCtrl = this._fb.array([]);
    this.myForm = this._fb.group({
      _id: divId._id,
      name: divId.name,
      pages: this.pagesCtrl,
      openaire: divId.openaire,
      connect: divId.connect,
      communities: divId.communities
    });
    for(let i = 0; i < divId.pages.length; i++) {
      this.pagesCtrl.push(this._fb.control(divId.pages[i]));
    }
    this.filteredPages = this.pageSearchCtrl.valueChanges.pipe(startWith(''),
      map(page => this._filter(page)));
    this.selectedPages = JSON.parse(JSON.stringify(divId.pages));
    this.divIdsModalOpen(this.alertModalSaveDivId, "", "Save Changes");
  }

  public newDivId() {
    this.pagesCtrl = this._fb.array([]);
    this.myForm = this._fb.group({
      _id: '',
      name: ['', Validators.required],
      pages: this.pagesCtrl,
      openaire: this._fb.control(true),
      connect: false,
      communities: true
    });
    this.filteredPages = this.pageSearchCtrl.valueChanges.pipe(startWith(''),
      map(page => this._filter(page)));
    this.modalErrorMessage = "";
    this.selectedPages = [];
    this.divIdsModalOpen(this.alertModalSaveDivId, "", "Save");
  }

  private divIdsModalOpen(modal: any, title: string, yesBtn: string) {
    if (!Session.isLoggedIn()) {
      this._router.navigate(['/user-info'], {
        queryParams: {
          "errorCode": LoginErrorCodes.NOT_VALID,
          "redirectUrl": this._router.url
        }
      });
    } else {
      modal.cancelButton = true;
      modal.okButton = true;
      modal.alertTitle = title;
      modal.okButtonText = yesBtn;
      modal.open();
    }
  }

  public divIdSaveConfirmed(data: any) {
    if (!Session.isLoggedIn()) {
      this._router.navigate(['/user-info'], {
        queryParams: {
          "errorCode": LoginErrorCodes.NOT_VALID,
          "redirectUrl": this._router.url
        }
      });
    } else {
      console.log(this.myForm.value)
      if (this.myForm.value['_id'].length == 0) {
        this.modalErrorMessage = "";

        this._helpContentService.saveDivId(<DivId>this.myForm.value, this.properties.adminToolsAPIURL).subscribe(
          divId => {
            this.divIdSavedSuccessfully(divId);
          },
          error => this.handleUpdateError("System error creating class", error)
        );
      } else {
        this._helpContentService.updateDivId(<DivId>this.myForm.value, this.properties.adminToolsAPIURL).subscribe(
          divId => {
            this.divIdUpdatedSuccessfully(divId);
          },
          error => this.handleUpdateError("System error updating class", error)
        );

      }
    }
  }

  public divIdSavedSuccessfully(divId: DivId) {
    this.checkboxes.push(<CheckDivId>{divId: divId, checked: false});
    this.applyCheck(false);
  }

  public divIdUpdatedSuccessfully(divId: DivId) {
    this.checkboxes.find(checkItem => checkItem.divId._id == divId._id).divId = divId;
    this.applyCheck(false);
  }

  public filterBySearch(text: string) {
    this.searchText = new RegExp(text, 'i');
    this.applyFilter();
  }

  public applyFilter() {
    this.checkboxes = [];
    this.divIds.filter(item => this.filterDivIds(item)).forEach(
      _ => this.checkboxes.push(<CheckDivId>{divId: _, checked: false})
    );
  }

  public filterDivIds(divId: DivId): boolean {
    let textFlag = this.searchText.toString() == '' || (divId.name).match(this.searchText) != null;
    return textFlag;
  }

  handleUpdateError(message: string, error) {
    if (error == null) {
      // this.formComponent.reset();
    } else {
      this.updateErrorMessage = message;
      console.log('Server responded: ' + error);
    }

    this.showLoading = false;
  }

  handleError(message: string, error) {
    this.errorMessage = message;
    console.log('Server responded: ' + error);

    this.showLoading = false;
  }

  getPages() {
    this.showLoading = true;
    this.errorMessage = "";
    this._helpContentService.getPages(this.properties.adminToolsAPIURL, this.selectedCommunityPid).subscribe(
      pages => {
        this.allPages = pages;
        this.showLoading = false;
      },
      error => this.handleError('System error retrieving pages', error)
    );

  }

  remove(page): void {
    let index = this.selectedPages.indexOf(page);
    if (index >= 0) {
      this.selectedPages.splice(index, 1);
      this.pagesCtrl.value.splice(index, 1);
      this.pagesCtrl.markAsDirty();
    }
  }

  selected(event: MatAutocompleteSelectedEvent): void {
    let newPage = event.option.value;
    if (this.selectedPages.indexOf(newPage) == -1) {
      this.selectedPages.push(event.option.value);
      this.pagesCtrl.push(this._fb.control(newPage));
      this.pagesCtrl.markAsDirty();
    }
    this.pageInput.nativeElement.value = '';
    this.pageSearchCtrl.setValue('');
  }

  private _filter(value: string): Page[] {
    if (!value || value.length == 0) {
      return this.allPages.slice();
    }
    const filterValue = value.toString().toLowerCase();
    return this.allPages.filter(page => page.name.toLowerCase().indexOf(filterValue) != -1);
  }
}